Eating foods high in vitamin C and natural estrogen or drinking ginger tea can help promote the onset of menstruation, as can taking progesterone medication. Whether it is through food or medication, it is important to make sure that you are not pregnant, because if you are pregnant, your period will not start. Foods with high vitamin C content, such as tomatoes, cucumbers and apples, are good for stimulating the secretion of estrogen in the body, thickening the endometrium and stimulating contractions, which are good for the onset of menstruation. For women with uterine cold, you can drink brown sugar and ginger tea before menstruation, which is good for removing body cold and menstruation, and can also prevent menstrual cramps. You can also eat more beans and their products, beans contain natural estrogen, which can regulate the endocrine to achieve the purpose of promoting menstruation. If the endometrium is thickened by ultrasound, you can also take progesterone progesterone pills to promote menstruation under the guidance of your doctor.